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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.document.predicate;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* A FeatureConjunction is a special type of Conjunction where
* all children are either a FeatureSet or a Negation (with an underlying FeatureSet).
* The underlying FeatureSets may only have one value.
*
* @author bjorncs
*/
public class FeatureConjunction extends PredicateOperator {
private final List<Predicate> operands;
public FeatureConjunction(List<Predicate> operands) {
validateOperands(operands);
this.operands = new ArrayList<>(operands);
}
private static void validateOperands(List<Predicate> operands) {
if (operands.size() <= 1) {
throw new IllegalArgumentException("Number of operands must 2 or more, was: " + operands.size());
}
if (!operands.stream()
.allMatch(FeatureConjunction::isValidFeatureConjunctionOperand)) {
throw new IllegalArgumentException(
"A FeatureConjunction may only contain instances of Negation and FeatureSet, " +
"and a FeatureSet may only have one value.");
}
long uniqueKeys = operands.stream().map(FeatureConjunction::getFeatureSetKey).distinct().count();
if (operands.size() > uniqueKeys) {
throw new IllegalArgumentException("Each FeatureSet key must have a unique key.");
}
}
private static String getFeatureSetKey(Predicate predicate) {
if (predicate instanceof FeatureSet) {
return ((FeatureSet) predicate).getKey();
} else {
Negation negation = (Negation) predicate;
return ((FeatureSet) negation.getOperand()).getKey();
}
}
public static boolean isValidFeatureConjunctionOperand(Predicate operand) {
return operand instanceof Negation
&& ((Negation) operand).getOperand() instanceof FeatureSet
&& isValidFeatureConjunctionOperand(((Negation) operand).getOperand())
|| operand instanceof FeatureSet && ((FeatureSet) operand).getValues().size() == 1;
}
@Override
public List<Predicate> getOperands() {
return operands;
}
@Override
protected void appendTo(StringBuilder out) {
for (Iterator<Predicate> it = operands.iterator(); it.hasNext(); ) {
Predicate operand = it.next();
if (operand instanceof Disjunction) {
out.append('(');
operand.appendTo(out);
out.append(')');
} else {
operand.appendTo(out);
}
if (it.hasNext()) {
out.append(" conj ");
}
}
}
@Override
public FeatureConjunction clone() throws CloneNotSupportedException {
return new FeatureConjunction(operands);
}
@Override
public int hashCode() {
return operands.hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof FeatureConjunction)) {
return false;
}
FeatureConjunction rhs = (FeatureConjunction)obj;
if (!operands.equals(rhs.operands)) {
return false;
}
return true;
}
}
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